The original circuit was good enough to use, however I wanted comfortably aligned 10Vpp outputs. So I added a simple opamp circuit to get the outputs 10Vpp and aligned from 0v. You probably wonder why I used fixed resistors instead of trimmers to control output voltage. Because I decided to add the opamp circuit after having finished 555 timer circuit, so there were not much room. I would have used trimmers over the resistors to get more precise result if I build it from scratch.
STRIPBOARD LAYOUT
All the trimmers are multi-turn trimmers.
FACEPLATE LAYOUT
The layout is actual size so you can use it as a drilling template.
It's a usb lamp using 555 timer. STRIPBOARD LAYOUT CABLE PINOUT The color codes might be different from above. In the case, you woul...
This module is an attenuator and an inverter at the same time and also a mixer with an additional input.
It works as an attenuator when the potentiometer is from center to right (fully clockwise) and when you rotate the potentiometer counter clockwise from center, it starts inverting the signal.
STRIPBOARD LAYOUT
I used +5v from PSU, so the offset function might be unstable.
If your PSU doesn't have +5v or you are worried about it, you would build it with LM4040. In the near future, I'd also build another one with LM4040 and compare both and see the difference.
And the potentiometers I used are center-detented, which is so convenient to know where 0v is.
As always I soldered 100nF decoupling capacitors underneath the boards so you can't see them on the stripboard layout. So please don't forget soldering decoupling capacitors when you build this module.
FACEPLATE LAYOUT
The dimension is 40mm x 129mm.
This layout is actual size so you can use it as a drilling template.
Code & Schematic: LINK STRIPBOARD LAYOUT LAYOUT UPDATED on Nov.19.2022 -corrected 10k resistor to a push button, which was wrongly conn...
Original schematic and more information: LINK1, LINK2
STRIPBOARD LAYOUT
I built it as 12v eurorack version, however somehow triangle and saw outputs exceeded 10v and sine out didn't reach 10v. So I replaced some resistors to get 10Vpp.
All the transistors are 2N3904, however the two TRs on the board where LT1013 is placed should be matched.
FACEPLATE LAYOUT
MEASUREMENT
Sine wave: 10.7Vpp
Pulse wave: 10.3Vpp / Duty Cycle: 26%~74%
Triangle wave: 12.3Vpp
Saw wave: 9.75Vpp
Rampoid wave
This module gives +/- 1V to 10V depending on the range knob location. Original schematic is made by Niklas Ronnberg. SCHEMATIC STRIPBOARD L...
This module is a unity gain MIXer and also a buffered multIPLE, so I call it MIXIPLE. Sound weird though.
SCHEMATIC
This schematic shows only a single MIXIPLE. If you are going to make a dual MIXIPLE like what I did, just simply duplicate it. Otherwise, you can use TL071 for U1 instead of TL072.
STIPBOARD LAYOUT
I omitted diodes such as 1N4001 for reverse voltage protection. If you are worried about it, please add diodes.
FACEPLATE LAYOUT
EURORACK SKIFF -3U and 59HP -6.5mm thick birch plywood -112mm x 313mm(*2) -112mm x 129mm(*2) -103mm x 300mm(*2) -129mm x 300mm(*1) -No rail...
Follow SLOWROOM